BIOS 255 Final Exam Questions and Answers with Rationales |
CHAMBERLAIN UNIVERSITY
Question 1. A major loss of the physiology represented by complement system would most likely produce
which consequence?
A. local spread of some viral infections would become easier
B. opsonization and lysis of susceptible microbes would be reduced
C. initial pathogen entry would increase and innate cellular defenses would be challenged more often
D. clearance of many extracellular bacteria and debris would slow
Correct Answer: B. opsonization and lysis of susceptible microbes would be reduced
Explanation: The most direct consequence is that opsonization and lysis of susceptible microbes would be reduced. That
prediction follows because complement system normally has this role: amplifies innate and antibody-mediated defense
through opsonization, inflammation, and membrane attack. The distractors reflect dysfunction of other structures or
processes rather than the most direct consequence here.
Question 2. A student is distinguishing closely related structures and processes. Which finding best
identifies acute inflammation?
A. it is an innate lymphocyte that can recognize altered expression patterns on target cells
B. it commonly produces redness, heat, swelling, and pain at an injured site
C. it drains both lower body quadrants and the left upper quadrant of the body
D. it is a dilated saclike structure in the upper abdomen
Correct Answer: B. it commonly produces redness, heat, swelling, and pain at an injured site
Explanation: The identifying feature is that it commonly produces redness, heat, swelling, and pain at an injured site.
That characteristic is consistent with acute inflammation and its normal role: localizes injury and recruits immune
defenses through vascular and cellular changes. The other findings are characteristic of different items and do not
identify acute inflammation as precisely.
Question 3. Which option accurately links a hallmark of tricuspid valve with the expected result of major
impairment?
A. Feature: it is the right atrioventricular valve and has three cusps supported by chordae tendineae / Dysfunction:
right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
B. Feature: it is the left atrioventricular valve and normally has two cusps / Dysfunction: right-sided systolic
regurgitation into the atrium would occur if the valve failed to close.
C. Feature: it lies between the right ventricle and pulmonary trunk and lacks chordae tendineae / Dysfunction:
right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
D. Feature: it sits at the outlet of the left ventricle and opens when ventricular pressure exceeds aortic pressure /
Dysfunction: right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
Correct Answer: A. Feature: it is the right atrioventricular valve and has three cusps supported by chordae
tendineae / Dysfunction: right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
Explanation: For tricuspid valve, the identifying feature is that it is the right atrioventricular valve and has three cusps
supported by chordae tendineae, and severe dysfunction would mean that right-sided systolic regurgitation into the
atrium would occur if the valve failed to close. Both halves of the pairing must be correct for the option to be valid. The
distractors combine the correct consequence with a defining feature that belongs to another item.
,Question 4. Which statement correctly connects tunica externa to what it does and how it works?
A. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because smooth muscle contraction and relaxation change lumen radius and vascular resistance.
B. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because endothelial cells regulate barrier properties, signaling, and interactions with blood components.
C. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because fibrous tissue protects the vessel and limits excessive stretching while blending with surrounding tissues.
D. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because elastic recoil during diastole helps maintain forward blood flow between heartbeats.
Correct Answer: C. It provides outer connective-tissue support and anchors many vessels to surrounding
structures; this is enabled because fibrous tissue protects the vessel and limits excessive stretching while blending
with surrounding tissues.
Explanation: The correct pairing links tunica externa to this role: provides outer connective-tissue support and anchors
many vessels to surrounding structures, and to this mechanism: fibrous tissue protects the vessel and limits excessive
stretching while blending with surrounding tissues. A correct function paired with the wrong mechanism is still an
incorrect description. The other options deliberately mix the role of tunica externa with mechanisms that belong to
different components.
Question 5. A major loss of the physiology represented by IgE would most likely produce which
consequence?
A. protection would wane as transferred antibodies are degraded because little or no memory is generated
B. circulating antibody production after B-cell activation would fall
C. mast-cell degranulation in classic immediate allergy would be reduced
D. systemic secondary humoral protection and placental antibody transfer would be reduced
Correct Answer: C. mast-cell degranulation in classic immediate allergy would be reduced
Explanation: The most direct consequence is that mast-cell degranulation in classic immediate allergy would be reduced.
That prediction follows because IgE normally has this role: mediates immediate hypersensitivity reactions and
contributes to defense against some parasites. The distractors reflect dysfunction of other structures or processes rather
than the most direct consequence here.
Question 6. A student creates a two-column study card for right atrium. Which feature/effect pair is
correct?
A. Feature: it is a thin-walled receiving chamber on the right side of the heart / Dysfunction: systemic venous return
would not be transferred normally into the right ventricle.
B. Feature: it is the receiving chamber located upstream from the mitral valve / Dysfunction: systemic venous return
would not be transferred normally into the right ventricle.
C. Feature: its wall is thicker than an atrial wall but thinner than the left ventricular wall / Dysfunction: systemic
venous return would not be transferred normally into the right ventricle.
D. Feature: it has the thickest myocardium of the four chambers / Dysfunction: systemic venous return would not be
transferred normally into the right ventricle.
Correct Answer: A. Feature: it is a thin-walled receiving chamber on the right side of the heart / Dysfunction:
systemic venous return would not be transferred normally into the right ventricle.
Explanation: For right atrium, the identifying feature is that it is a thin-walled receiving chamber on the right side of the
heart, and severe dysfunction would mean that systemic venous return would not be transferred normally into the right
ventricle. Both halves of the pairing must be correct for the option to be valid. The distractors combine the correct
consequence with a defining feature that belongs to another item.
, Question 7. How is the normal role of bronchiole carried out most directly?
A. airways transport air while mucosa and supportive structures condition it before the respiratory zone
B. smooth-muscle tone changes airway radius and therefore strongly influences airflow resistance
C. cartilages support the passage while intrinsic muscles adjust vocal folds and protective closure
D. turbulent flow increases contact between inspired air and vascular mucosa
Correct Answer: B. smooth-muscle tone changes airway radius and therefore strongly influences airflow
resistance
Explanation: The correct mechanism is that smooth-muscle tone changes airway radius and therefore strongly influences
airflow resistance. It explains the normal function of bronchiole: conducts and regulates airflow within the lung without
cartilage plates in its wall. The other mechanisms belong to different structures or processes in the same broad system.
Question 8. When reviewing normal anatomy and physiology, which feature belongs to collecting
lymphatic vessel?
A. multiple vessels typically enter a node and deliver tissue-derived antigens
B. it drains the right side of the head and thorax and the right upper limb
C. it drains both lower body quadrants and the left upper quadrant of the body
D. it resembles a thin-walled vein and contains numerous one-way valves
Correct Answer: D. it resembles a thin-walled vein and contains numerous one-way valves
Explanation: The identifying feature is that it resembles a thin-walled vein and contains numerous one-way valves. That
characteristic is consistent with collecting lymphatic vessel and its normal role: transports lymph toward larger trunks
and ducts while preventing backflow. The other findings are characteristic of different items and do not identify
collecting lymphatic vessel as precisely.
Question 9. A major loss of the physiology represented by epithelial barrier defense would most likely
produce which consequence?
A. opsonization and lysis of susceptible microbes would be reduced
B. clearance of many extracellular bacteria and debris would slow
C. initial pathogen entry would increase and innate cellular defenses would be challenged more often
D. local spread of some viral infections would become easier
Correct Answer: C. initial pathogen entry would increase and innate cellular defenses would be challenged more
often
Explanation: The most direct consequence is that initial pathogen entry would increase and innate cellular defenses
would be challenged more often. That prediction follows because epithelial barrier defense normally has this role: blocks
pathogen entry through intact skin, mucous membranes, secretions, and mechanical clearance. The distractors reflect
dysfunction of other structures or processes rather than the most direct consequence here.
Question 10. Which normal outcome is most directly associated with intact fibrinogen physiology?
A. The system demonstrates that it serves as the liquid matrix that transports cells, proteins, nutrients, hormones,
electrolytes, and wastes.
B. The system demonstrates that it provides much of the colloid osmotic pressure of plasma and also carries several
poorly water-soluble substances.
C. The system demonstrates that it transports oxygen and contributes to carbon dioxide transport through
hemoglobin and intracellular enzymes.
D. The system demonstrates that it provides the soluble plasma precursor from which fibrin is formed during
coagulation.
Correct Answer: D. The system demonstrates that it provides the soluble plasma precursor from which fibrin is
formed during coagulation.
Explanation: The strongest evidence is the outcome linked to the normal role of fibrinogen: provides the soluble plasma
precursor from which fibrin is formed during coagulation. This expected result depends on the mechanism that thrombin
CHAMBERLAIN UNIVERSITY
Question 1. A major loss of the physiology represented by complement system would most likely produce
which consequence?
A. local spread of some viral infections would become easier
B. opsonization and lysis of susceptible microbes would be reduced
C. initial pathogen entry would increase and innate cellular defenses would be challenged more often
D. clearance of many extracellular bacteria and debris would slow
Correct Answer: B. opsonization and lysis of susceptible microbes would be reduced
Explanation: The most direct consequence is that opsonization and lysis of susceptible microbes would be reduced. That
prediction follows because complement system normally has this role: amplifies innate and antibody-mediated defense
through opsonization, inflammation, and membrane attack. The distractors reflect dysfunction of other structures or
processes rather than the most direct consequence here.
Question 2. A student is distinguishing closely related structures and processes. Which finding best
identifies acute inflammation?
A. it is an innate lymphocyte that can recognize altered expression patterns on target cells
B. it commonly produces redness, heat, swelling, and pain at an injured site
C. it drains both lower body quadrants and the left upper quadrant of the body
D. it is a dilated saclike structure in the upper abdomen
Correct Answer: B. it commonly produces redness, heat, swelling, and pain at an injured site
Explanation: The identifying feature is that it commonly produces redness, heat, swelling, and pain at an injured site.
That characteristic is consistent with acute inflammation and its normal role: localizes injury and recruits immune
defenses through vascular and cellular changes. The other findings are characteristic of different items and do not
identify acute inflammation as precisely.
Question 3. Which option accurately links a hallmark of tricuspid valve with the expected result of major
impairment?
A. Feature: it is the right atrioventricular valve and has three cusps supported by chordae tendineae / Dysfunction:
right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
B. Feature: it is the left atrioventricular valve and normally has two cusps / Dysfunction: right-sided systolic
regurgitation into the atrium would occur if the valve failed to close.
C. Feature: it lies between the right ventricle and pulmonary trunk and lacks chordae tendineae / Dysfunction:
right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
D. Feature: it sits at the outlet of the left ventricle and opens when ventricular pressure exceeds aortic pressure /
Dysfunction: right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
Correct Answer: A. Feature: it is the right atrioventricular valve and has three cusps supported by chordae
tendineae / Dysfunction: right-sided systolic regurgitation into the atrium would occur if the valve failed to close.
Explanation: For tricuspid valve, the identifying feature is that it is the right atrioventricular valve and has three cusps
supported by chordae tendineae, and severe dysfunction would mean that right-sided systolic regurgitation into the
atrium would occur if the valve failed to close. Both halves of the pairing must be correct for the option to be valid. The
distractors combine the correct consequence with a defining feature that belongs to another item.
,Question 4. Which statement correctly connects tunica externa to what it does and how it works?
A. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because smooth muscle contraction and relaxation change lumen radius and vascular resistance.
B. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because endothelial cells regulate barrier properties, signaling, and interactions with blood components.
C. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because fibrous tissue protects the vessel and limits excessive stretching while blending with surrounding tissues.
D. It provides outer connective-tissue support and anchors many vessels to surrounding structures; this is enabled
because elastic recoil during diastole helps maintain forward blood flow between heartbeats.
Correct Answer: C. It provides outer connective-tissue support and anchors many vessels to surrounding
structures; this is enabled because fibrous tissue protects the vessel and limits excessive stretching while blending
with surrounding tissues.
Explanation: The correct pairing links tunica externa to this role: provides outer connective-tissue support and anchors
many vessels to surrounding structures, and to this mechanism: fibrous tissue protects the vessel and limits excessive
stretching while blending with surrounding tissues. A correct function paired with the wrong mechanism is still an
incorrect description. The other options deliberately mix the role of tunica externa with mechanisms that belong to
different components.
Question 5. A major loss of the physiology represented by IgE would most likely produce which
consequence?
A. protection would wane as transferred antibodies are degraded because little or no memory is generated
B. circulating antibody production after B-cell activation would fall
C. mast-cell degranulation in classic immediate allergy would be reduced
D. systemic secondary humoral protection and placental antibody transfer would be reduced
Correct Answer: C. mast-cell degranulation in classic immediate allergy would be reduced
Explanation: The most direct consequence is that mast-cell degranulation in classic immediate allergy would be reduced.
That prediction follows because IgE normally has this role: mediates immediate hypersensitivity reactions and
contributes to defense against some parasites. The distractors reflect dysfunction of other structures or processes rather
than the most direct consequence here.
Question 6. A student creates a two-column study card for right atrium. Which feature/effect pair is
correct?
A. Feature: it is a thin-walled receiving chamber on the right side of the heart / Dysfunction: systemic venous return
would not be transferred normally into the right ventricle.
B. Feature: it is the receiving chamber located upstream from the mitral valve / Dysfunction: systemic venous return
would not be transferred normally into the right ventricle.
C. Feature: its wall is thicker than an atrial wall but thinner than the left ventricular wall / Dysfunction: systemic
venous return would not be transferred normally into the right ventricle.
D. Feature: it has the thickest myocardium of the four chambers / Dysfunction: systemic venous return would not be
transferred normally into the right ventricle.
Correct Answer: A. Feature: it is a thin-walled receiving chamber on the right side of the heart / Dysfunction:
systemic venous return would not be transferred normally into the right ventricle.
Explanation: For right atrium, the identifying feature is that it is a thin-walled receiving chamber on the right side of the
heart, and severe dysfunction would mean that systemic venous return would not be transferred normally into the right
ventricle. Both halves of the pairing must be correct for the option to be valid. The distractors combine the correct
consequence with a defining feature that belongs to another item.
, Question 7. How is the normal role of bronchiole carried out most directly?
A. airways transport air while mucosa and supportive structures condition it before the respiratory zone
B. smooth-muscle tone changes airway radius and therefore strongly influences airflow resistance
C. cartilages support the passage while intrinsic muscles adjust vocal folds and protective closure
D. turbulent flow increases contact between inspired air and vascular mucosa
Correct Answer: B. smooth-muscle tone changes airway radius and therefore strongly influences airflow
resistance
Explanation: The correct mechanism is that smooth-muscle tone changes airway radius and therefore strongly influences
airflow resistance. It explains the normal function of bronchiole: conducts and regulates airflow within the lung without
cartilage plates in its wall. The other mechanisms belong to different structures or processes in the same broad system.
Question 8. When reviewing normal anatomy and physiology, which feature belongs to collecting
lymphatic vessel?
A. multiple vessels typically enter a node and deliver tissue-derived antigens
B. it drains the right side of the head and thorax and the right upper limb
C. it drains both lower body quadrants and the left upper quadrant of the body
D. it resembles a thin-walled vein and contains numerous one-way valves
Correct Answer: D. it resembles a thin-walled vein and contains numerous one-way valves
Explanation: The identifying feature is that it resembles a thin-walled vein and contains numerous one-way valves. That
characteristic is consistent with collecting lymphatic vessel and its normal role: transports lymph toward larger trunks
and ducts while preventing backflow. The other findings are characteristic of different items and do not identify
collecting lymphatic vessel as precisely.
Question 9. A major loss of the physiology represented by epithelial barrier defense would most likely
produce which consequence?
A. opsonization and lysis of susceptible microbes would be reduced
B. clearance of many extracellular bacteria and debris would slow
C. initial pathogen entry would increase and innate cellular defenses would be challenged more often
D. local spread of some viral infections would become easier
Correct Answer: C. initial pathogen entry would increase and innate cellular defenses would be challenged more
often
Explanation: The most direct consequence is that initial pathogen entry would increase and innate cellular defenses
would be challenged more often. That prediction follows because epithelial barrier defense normally has this role: blocks
pathogen entry through intact skin, mucous membranes, secretions, and mechanical clearance. The distractors reflect
dysfunction of other structures or processes rather than the most direct consequence here.
Question 10. Which normal outcome is most directly associated with intact fibrinogen physiology?
A. The system demonstrates that it serves as the liquid matrix that transports cells, proteins, nutrients, hormones,
electrolytes, and wastes.
B. The system demonstrates that it provides much of the colloid osmotic pressure of plasma and also carries several
poorly water-soluble substances.
C. The system demonstrates that it transports oxygen and contributes to carbon dioxide transport through
hemoglobin and intracellular enzymes.
D. The system demonstrates that it provides the soluble plasma precursor from which fibrin is formed during
coagulation.
Correct Answer: D. The system demonstrates that it provides the soluble plasma precursor from which fibrin is
formed during coagulation.
Explanation: The strongest evidence is the outcome linked to the normal role of fibrinogen: provides the soluble plasma
precursor from which fibrin is formed during coagulation. This expected result depends on the mechanism that thrombin
